Service entrance head



March 27, 1956 w, GILL 2,739,999

SERVICE ENTRANCE HEAD Filed Aug. 13, 1952 United States Patent 2,739,999 SERVICE ENTRANCE HEAD William L. Gill, Webster Groves, Mo., assignor to J. A.

Weaver Company, St. Louis, Mo., a corporation of Missouri Application August 13, 1952, Serial No. 304,054 1 Claim. (Cl. 174-81) conduit, ing a substantially continuous annular shoulder at the upper end of the socket for abutment with the upper ends of conduits varying in their outside diameters. A twopart adjustable clamp is positioned below the shoulder for tightly gripping the conduit, irrespective of its outside diameter.

Another object is to secure the head and conduit together without threading the conduit or without using a split ring and contracting sleeve with the head, as is customary.

These and other detail objects are attained by the structure shown in the accompanying drawing, in which:

'Figure 1 is an exploded perspective view of a service entrance head embodying the present invention.

Figure 2 is a side view of the service head in assembled condition.

Figure 3 is a vertical transverse section taken on the line 3-3 of Figure 2.

Figure 4 is a bottom view of the cap and base member.

Figure 5 is an inside elevation of the movable clamp.

In the drawings, the service entrance head comprises a hood-forming cap 1 and a base or mounting member 2, each being preferably of cast aluminum or of a suitable alloy. Base member 2 includes upwardly and forwardly projecting side portions 3, 4 interconnected by a U-shaped flange 5 for cooperation with the forward end of plate 7 having a plurality of apertures 8 for passage therethrough of electric cables. Insulating with an annular shoulder 9 electrical conduit c. The upper end of socket 18 presents against the upper edge of conduit c. The rear portion of base member 2 also includes a depending segmental clamping collar or fixed jaw 20, the inner face of which is continuous with socket 18. Collar 20 is provided with outwardly projecting lugs 21, each being tapped, as at 23, for clamping screws 26, which are received within registering apertures 27 in lugs 28 of a cooperating clamping collar or movable jaw 30.

The inner arcuate face of clamping collar 30 has substantially the same radius as that of clamping collar 20 and is provided with a plurality of ridges or serrations 31 for better gripping conduit 0.

In use, base member 2 is positioned upon the upper end of conduit c with the upper margin thereof against continuous shoulder 19. Clamping screws 26 are then tightened for drawing clamping collars 20 and 30 toward each other for retainingly gripping conduit 1: therebetween. The electric cables sheathed within conduit 0 are led upwardly and through apertures 8 in insulating plate 7 seated on flange 5. Thereupon, cap 1 is positioned upon base member 2 and fixed thereon by binding screws 14. By the unique interrelationship of the parts, the head may be readily engaged upon, or removed from, a conduit, and will reliably remain in assembled condition.

As shown above, conduit 0 abuts shoulder 19 substantially throughout the area of its upper end. The relatively large width of shoulder 19 adapts it for seating conduits of varying outside diameter. The service head may grip conduits of ditferent outside diameter. The friction clamp makes it unnecessary to thread the conduit to effect a secure assembly of the head and conduit.

he details of construction may without departing from the spirit scope of the claim is contemplated.

What is claimed is:

A service entrance head adapted for mounting on the upper end of a tubular pipe electric conduit, comprising a rigid one-piece inverted cup-like cap with a downwardly facing shoulder on its inner wall and spaced upwardly from the lower edge of the cap, a rigid one-piece supportengageable base member received in the lower portion of said cap and seated against said shoulder and having a horizontal top wall spaced downwardly from the upper part of the cap and provided with a through vertical References Cited in the file of this patent UNITED STATES PATENTS Re.18,773 Thomas, Jr. Mar. 21, 1933 1,069,820 Sessions Aug. 12, 1913 1,284,291 Fort Nov. 12, 1918 1,327,409 Schneider Jan. 6, 1920 1,822,879 Brachtl Sept. 15, 1931 1,839,945 Boyton Jan. 5, 1932 1,888,645 Vibber Nov. 22, 1932 2,423,350 Stockton July 1, 1947 2,490,253 Buchanan Dec. 6, 1949 2,648,721 Wayman Aug. 11, 1953 

